L4957A 查看數據表（PDF） - STMicroelectronics
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L4957A Datasheet PDF : 7 Pages
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L4957A
THERMAL DATA
Symbol
Rth j-case
Rth j-amb
Parameter
Thermal Resistance Junction-case
Thermal Resistance Junction-ambient
Thermal Shutdown
Thermal Hysteresis
Max.
Max.
Typ.
Typ.
TO220
D2PAK
2.5
3
50
60
150
20
Unit
°C/W
°C/W
°C
°C
ELECTRICAL CHARACTERISTICS (Tj = 25°C, VIN = 5V, unless otherwise specified).
• = Specifications referred to TJ from 0°C to +125°C.
Symbol
Parameter
Test Condition
Min. Typ. Max. Unit
VIN
Operating Supply Voltage
3
14
V
VO
Output Voltage
3.15V < VIN < 5.25V; IO = 0.1A
VIN = 3.3V ±5%; 0.1A < IO < 5A
1.485 1.5 1.515 V
• 1.47
1.5
1.53
V
VIN = 3.3V ±5% IO = 0.1A
1.782 1.8 1.818 V
VIN = 5V ±5%
VIN = 3.3V ±5% (0.1A < IO < 45A) • 1.764 1.8 1.836
V
VIN = 5V ±5% 0.1A < IO < 5A
VIN = 3.3V ±5% IO = 0.1A
2.475 2.5 2.525 V
VIN = 5V ±5%
VIN = 3.3V ±5% (0.1A < IO < 2.2A) • 2.45
2.5
2.55
V
VIN = 5V ±5% 0.1A < IO < 5A
RDSON
IO
IQ
Drain-Source ON
Resistance
Current Limiting
Quiescent Current
VIN = 5V ±5%
VIN = 5V ±5%
IO = 0.1A
0.1A < IO < 5A
3V < VIN < 14V
3.267 3.3 3.333 V
• 3.234 3.3 3.366
V
•
300 mΩ
• 5.1
6.3
7.5
A
•
0.6
2
mA
Ripple Rejection
f = 120Hz, IO = 1A
VIN = 5V ∆VIN = 2VPP
60
75
dB
Figure 1: Line Regulation vs. Junction
Temperature
Figure 2: Load Regulation
5
5
4.5
3V < Vin < 6.5V
4
Iout = 10mA
3.5
4
Vin = 5V
3
Tj = 25 °C
(Pulsed technique has been used)
2
Vout = 1.5V
1
3
0
2.5
-1
2
-2
1.5
-3
1
-4
0.5
0
-40 -20 0 20 40 60 80 100 120 140 160
Tj [°C]
-5
0
1
2
3
4
5
Iout [A]
3/7
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